Each grading period I like to change up classroom jobs. To make it more like a real job application, I created this file for my 4th grade students, though it would work for 5th or 6th as well. It contains a list of jobs with descriptions, a 1-page application which students fill out, and an acceptance or reassignment letter. Similar to real jobs, all students can't always get the jobs they want because too many people apply. So the 'reassignment' letter reassigns the student to another position that meets his/her skills and strengths but also gives the student a list of vacancies if he/she doesn't like the assignment and can reapply.
Please edit the file to meet your class job needs. I hope it is useful to you.
Some jobs my colleagues have added have been: Locker Assistant (to help others with their combinations); Lunch Counter (polls students and submits lunch count to the cafeteria); Carpool Helper (helps open car doors during dismissal for younger students).